Craft Sportswear Men's Glow High Visibility Bike Cycling Reflective Full Zip Short Sleeve Jersey Shirt: protective/riding/compression/cooling 94% Polyester, 6% Elastane Imported Six-channel fiber construction pulls perspiration vapor off the body to keep you cool Ergonomic design for perfect riding-position fit Soft, elastic fabric for optimal fit and comfort Mesh Superlight at hot spots for active cooling and moisture transport Soft, ergonomic sleeve endings